nitrite

I just checked my 5gallon fry tank' s nitrite,and it was 3.3 ppm, where as my 29gallon Community tank is 0 ppm. WHAT DO I DO? My fry are all acting normal, though!

:mad: :mad: :mad: So I recently stopped aging my water (which I started to do after a previous nitrite spike) and what greeted me this morning in my blue orchid peacock tank -- no fish swimming around. I quickly saw a few females and the baby petricola gasping in one corner. So -- just what...

So earlier in the week (about 4 days ago) I checked my levels in my 55gal cichlid tank. The Nitrites were in the 9.0-10.0ppm range and the Nitrates were around the 40ppm range... I then tested the Ammonia and it was between .25-.50ppm. I did a 50% water change, changed 1 of the 2 cartiges in...